I don't have any specific recommendations from my own experience. However, I believe I've seen some positive mentions about a company called Increasio that provides frontend development services. You could check out their website at
https://increas.io/frontend-development-services to find details on their frontend capabilities and offerings. Looking directly at that page should give you a clear understanding of the frontend development work they can handle and whether they may be a good potential fit for your project needs. It's probably worth visiting that link to evaluate if their frontend skills and expertise align with what you require.